Clamp.



w. J. 'HUNKIN.

CLAMP.

APPLICATION FILED DEC.20. I913.

Patented Sept. 14, 1915.

jeam

ZZZ 007 I WILLIAM J. HUNKIN, OF CLEVELAND, OHIO, ASSIGNOB TO THEHUNKIN-CONKEY CONSTRUCTION COIMZPANY, OF CLEVELAND, OHIO, A CORPORATIONOF OHIO.

CLAW.

Specification of is latent. Pategnted Sept. 14, 19115.

Application filed December 20, 1913. Serial No. 808,021.

To all le-710m it may concern Be it known that I. WILLIAM J. HUXKIX,

a citizen of the United States, resident of ter which will be economicalof manufacture, eflicient in its operation and which may be readilyattached and detached.

One specific object is to provide a clamp which may be advantageouslyused to form adjustable shoring used in the erection of concretestructures and which may be adjusted as to length so that it may be usedin structures of varying dimensions.

The annexed drawing andthe following description set forth in detailcertain means embodying my invention, the disclosed means, however,constituting but one of various mechanical forms in which the principleof the invention may be applied.

In said annexed drawing: Figure 1 represents a side elevation of a pieceof shoring constructed of two pieces of square timber secured to eachother by means of my improved clamp. 2 represents a. plan, upon anenlarged scale, of said clamp, and Fig. 3 a side elevation thereof. Fig.drepresents a longitudinal section of said clamp.

The illustrated embodiment of my invention comprises a malleable ironcasting consisting of a cross-piece 2. and two parallel legs 3, 3,projecting therefrom to form a U-shaped main member .1, Fig. 2, the distance from each other at which said legs are spaced being such as may berequired to permit the timber of the desired crosssectlonal dimensionsto be placed therebetween. The said cross-piece and legs are formed witha strengthening rib 4, and the outer or free ends of the legs areenlarged as shown, to permit of the formation therein of the twobearings 5, 5, and the slots 6, 6, communicating therewith. In thesebear ings are respectively seated two .trunnions 7, 7, and the width ofslots 6, 6, is such that these trunnions may freely pass therethrough.Theiouter end of each trunnion is preferably formed with a flange 8.Between the two trunnions is a member 9 formed with a serratedcam-surface 10. By oscil lating the cam-member it will be seen that the.distance between the cross-piece 2 and the cam-surface may be varied.The inner side of said cross-piece is formed with a longitudinal rib 11of triangular. cross-section, as shown in Fig. 4.

In applying the above-described clamps, the cam-member is removed fromthe mainmember by lifting the trunnions out of their bearings throughthe slots. The main-men ber is then caused-to embrace the contiguousportions of the' two timbers to be secured,

and at an angle, as shown in Fig. 1, the

cross-piece 2 being placed so as to cause the rib 11 to engage thesurface of that piece of timber to which it is contiguous. Thecam-member is then replaced in its bearings and the cam, with the' aidof a hammer, partially rotated on its axis so as to cause theserrations" 10 and rib '11 to bite into the contiguous surfaces of thetimbers. The

'on of the inclination which is imparted to the clamp is such that anymovement of the two timbers upon each other and due to the force exertedby thesupported load, will move or tend to move the clamp into aposition more angular with reference toa plane perpendicular to thedirection of such force, and hence cause the clamp to still more-tightlybind. When it is desired to loosen the clamp for removal it is onlynecessary to strike same with a hammer so as to impart less of suchpreviously described singularity, as will be readily under stood.

By means of the above-described device, two pieces of timber may besecured to each ,other with great facility and firmness so that they maybe used for shoring and resist acompressing force of great degreewithout displacing the two timbers with reference to each other.

By making both timbers of a length less than the mjnimlun distancebetween the points of support and load which would ordinarily beencountered. it will be seen that a range of adjustability may beobtained which will permit of the use of the timbers when secured toeach other, under practically all ordinary conditions in a given kind ofbuilding construction.

Having fully described my invention, what I claim and desire to secureby Letters Patent is In a clamp of the class described, the combinationwith a U-shaped bracket, the free ends of the arms thereof beingenlarged and provided with bearings. said enlarged portions of the armsalso being provided with upwardly and rearvvardlv inclined slotscommunicating with the bearings and terminating in the upper edges ofthe arms, and a transversely extending biting tooth formed on andextending the full length of the inner face of the face of said bracket;

of a cam member consisting of a bod portion of substantially triangulardesign in cross section and of a length to fit between the arms of theU-shaped bracket. one face thereof being serrated for its full length,trunnions projecting laterally from the ends of said cam member tooperate loosely in the aforesaid bearings and removable from thebrackett-hrough said slots and head portions formed on the ends of thetrunnions to guide the latter in the slots of the bracket arms andprevent lateral movement of the cam in the bearings.

Signed by me, this 11th day of December,

V. J. HUXKIN. Attested by- D. Joxizs, C. E. MILLER.

